find the value of 64x cube + 125 z cube , if 4x+5z=19 and xz=5
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64x^3+125y^z=
(4x + 5y) - 20xz
19 - 100
or 100 - 19
81
(4x + 5y) - 20xz
19 - 100
or 100 - 19
81
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